POLAR ICE-CAPS AND THEIR 



INFLUENCE IN CHANGING 



SEA LEVELS. 



[Reing Paper read before the Geological Society of Glasgow, 

 February 16, 1888.] 



THE subject I have to speak about this evening 

 is not exactly geological. I may say that the 

 immediate proposal to lecture on such a subject is 

 to be found in an extract which I shall read to you 

 from Dr. Croll's book on Climate and Time. In 

 chaps, xxiii., xxiv., of this volume Mr. Croll deals 

 with the physical causes of the submergence and 

 emergence of land during the glacial epoch, and he 

 has given some very curious, while at the same 

 time mathematically correct, explanations of the 

 effects due to a certain assumed displacement of 

 ice from one hemisphere to the other. After 



